btrfs-progs: move sha256 from tests to crypto/

The SHA256 is going to be used in the future, so this makes it a second
user and we also have the appropriate directory now.

Signed-off-by: David Sterba <dsterba@suse.com>

Makefile

@@ -642,7 +642,7 @@ library-test.static: library-test.c $(libs_static)
 	@echo "    [TEST CLEAN] $@"
 	$(Q)$(RM) -rf -- $(TMPD)
 
-fssum: tests/fssum.c tests/sha224-256.c
+fssum: tests/fssum.c crypto/sha224-256.c
 	@echo "    [LD]     $@"
 	$(Q)$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
 

tests/fssum.c

@@ -29,7 +29,7 @@
 #include <assert.h>
 #include <time.h>
 #include <stdint.h>
-#include "tests/sha.h"
+#include "crypto/sha.h"
 
 #define CS_SIZE 32
 #define CHUNKS	128